Helically wound body



July l0, 1945. w. KAsTEN 2,380,111

l HELICALLY-woUND BODY Fl'ed June 19, 1943 2 Shee'tS-Sheet l l l l l l Il l.

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Patented July 10, 1945 OFFICE HELICALLY WOUND BODY Walter Kasten,Franklin, Mich., assignor to Ralph L. Skinner, Detroit, Mich.

Application June 19, 1943, Serial No. 491,433

(Cl. 13S-73) 4 Claims.

The present'l invention concerns the production of hollow members orbodies, made of con; volutely-wound or coiled bands, strips or ribbons,which may be satisfactorily used in various relations, such asedge-filtration filters, tubes, conduits, distributors, etc.

A main or leading aim of the invention is to provide such bodies whichare novel and which have several outstanding advantages, among which maybe mentioned simplicity, effectiveness, and economy, as well as otherstructural and functional benefits.

One feature of the invention involves the helical winding of aninitially longitudinally-folded strip or ribbon of suitable material,such as paper or the like, on a revolving mandrel or form, so that adouble-thickness of such band or strip is thus convolutely coiledthereon after which such double-thickness may be reduced tosingle-thickness of the strip. l

Various other novel features will become apparent from the followingdetailed description,

illustrated more or less diagrammatically in th'e accompanying drawings,forming a part of this specification, and to which reference should behad. l

In the drawings: Y

Figure 1 illustrates the lengthwise folding of such band or tape:

Figure 2 is a cross-section on line 2-2 of Figure 1;

Figure 3 is a similar cross-section on line 3-3 of Figure 1;

Figure 4 is an analogous transverse section on line of Figure l;

Figure 5 is a face view of a short section of such strip or band;

Figure 6 shows a portion of the ribbon after such folding or bending;

Figure 7 presents a cross-section through the folded ribbon in itscompleted form;

Figure 8 portrays the winding of the folded ribbon on th'e revolvingform, such gure including a heat-treating appliance as well as means forsevering the completed body into parts or units;

,Figure 9 is a transverse section on line 9 9 of Figure 8 on a smallerscale;

Figure 10 is a cross-section on line |0|0 of Figure 8 Figures 11, 12 and13 illustrate various steps in the winding operation and Figure 14 showsthe grinding off or removal of the outer portion of the wound body.

In carrying out one desirable or preferred mode oi.' practicing thenovel invention of this application, a strip, ribbon, band or tape ofsuitable material, such as crepe-paper (Figure 5), having oblique,substantially-parallel rugosities |2 or shallow alternating ribs andvalleys on both of its opposite faces, disposed preferably at about tothe lengthwise dimension of the strip, is preliminarily passed throughthree pairs of power-actuated rollers I3-I4, |5|6 and |`||8 to fold th'epaper gradually progressively along its middle longitudinal line, asillustrated in Figures l, 2, 3 and 4, such doubling of the paper 0nitself as presented in Figure 6, causing the rugosities or ribs of thetwo contiguous lengthwise parts to cross one another at from about 20 to40, thus assuring that the"ribs 0f either part will not become nested inthe valleys of the other part, this being true also of the ribs andvalleys of two, adjacent, contacting convolutions of the strip after itis wound.

Such folded strip or band, with its two inner surfaces in contact withone another (Figure 7), is fed between a pair of rubber-surfaced,restraining pressure-rollers I9, 2|, the pressure of which on the stripmay be adjusted by screws 22 acting on the bearings of the upper roller2|.

From such restraining or retarding rollers, the

folded paper-strip passes to the rotary form or mandrel 23 revolved onits axis by a pulley-andbelt drive 24, 25, or by any other appropriatemeans, such mandrel having an annular, sloping shoulder 26 against whichthe strip bears with its folded-edge disposed outermost. Y This mandrelis equipped with a collar or sleeve 2l free to turn and slide on thesmaller-diameter section of the mandrel and it has a sloping end surface28 facing and parallel to the shoulder 26, the collar being initiallypressed toward the shoulder by a coiled-spring 29 encircling the mandreland having a suitable friction engagement therewith.

A thin, stationary, metal, blade separator or guide 3| (Figure 11) has aterminal part 32 between the sloping surface of such shoulder andadjacent, companion, inclined surface of the sleeve or collar, and anintermediate portion 33 just above, or beyond, and close to, theshoulder.

Assuming that the forward end of the folded crepe-paper ribbon has beenfed between the shoulder 26 and the part 32 of the blade and beneath theportion 33 of the latter, such portions of the blade guide thelongitudinally-folded paper-strip between themselves and the shoulder,and the part 33 prevents the forcing out of the strip beyond the outerperiphery of the shoulder.

Rotation of the mandrel now has a tendency to carry the paper-striparound and elongates the same in graduated degree transversely of thestrip by reducing the crepe at the outer bend, this action naturallyrolling the strip around the mandrel, in this way progressively forminga tube, similar to a closed coiled spring, the convolutions of which areproduced by the duplex strip of paper.

As will be readily understood, the springpressed collar or sleeve, byreason of the frictional engagement of its spring with the mandrel,holds the convolutions pressed together, and, after a suitable length ofthe tube has been thus formed, the spring and collar are manuallyremoved from the mandrel, the action of the collar from then on beingreplaced or superceded by the friction of the tube itself on themandrel.

Inasmuch as there is a predetermined amount of tension applied to thepaper-strip by the resilient-rollers I9 and 2| which causes elongationof part of the strip by the rotation of the mandrel, the amount of whichdepends upon the angle which the face of the strip describes with theaxis of the finished tube and the distance from such axis, a certainsmall amount of slippage takes place between the 'sloping shoulder ofthe mandrel and the strip, the indicated restraining action or tensionon the strip causing the thus formed-tube to rotate at a slower speedthan that of the mandrel.

'Io prevent undue heating at the shoulder portion of the mandrel due tothe specified friction, produced by the above-mentionedspeed-differential, which might have a detrimental eiiect on the strip,especially if the latter is impregnated with an agent causing it to tendtoA adhere to the shoulder, a small amount of a lubricant or othersuitable product may be applied to the corresponding face of the stripor shoulder, or to both, and as an example, a properly-supported wick 3|partially immersed in a supply 35 of such a medium in a receptacle orcontainer 36 is positioned to engage one face of the strip before itcontacts with the shoulder.

Also, to release some of the pressure, the mandrel may be tapered inminor degree so that as the wound body is built up thereon, the frictionof the spring on the mandrel is correspondingly reduced.

In order to adhere the duplex-convolutions of the helically-wound bodytogether, an adhesive may be applied to the other face of the strip by aroller 3l to which the adhesive medium is supplied from a container 38in any approved manner.

A wound -body 50 of this character and of the desired length may be madeand removed fromv the mandrel ready for use as a washer, bearing,conduit, etc.

If preferred to cement the turns or convolutions of the strip Or ribbontogether more C0111- pletely, the longitudinal parallel sections of thestrip may be aiiixed together or united before the winding on themandrel by applying an appropriate adhesive to the roller I8, the latterreceiving it from a supply tank 39 (Figure 4).

In some instances, particularly where the coiled body is to be used as afilter, and also in other cases, the wound body may have its outerAportion only consisting of the longitudinally bent parts of the ribbon,turned or ground off by any appropriate means 4I as shown in Figure 14.

In making an edge-filtration filter by this method, it is preferable toimpregnate the paperstrip thoroughly with a phenolic-resin or otherappropriate material before the winding, and after such winding to passthe wound body, as it is formed, through a heater 42 maintained at asuitable temperature to polymerize the resin so as to render itunchangeable and unaiiccted by the iiuid, gas or liquid, to be filteredor by any of its contaminating agents, and thereafter cut the elongatedbody into appropriate individual units by a rotary cutter or saw 43, thegrinding oli of the outer surface portion referred to above taking placeeither before or after such severance into parts.

In such a case, the polymerized resin may be used as the adhesive tobind or adhere the two parts of the ribbon together and the resultingduplex convolutions together.

In this connection it should be borne in mind that when crepe-paper, orits equivalent, is used as the helically-wound ribbon, its convolutionscan be adhered together, without closing the spaces between such adheredlayers and through which shallow gaps the fluid to be filtered ordistributed passes, and such adhering means may be theimpregnating-agent which makes such material stable against detrimentalaction thereon by the media with which it comes in contact, when actingas a filter, distributor, etc.

Instead of folding lengthwise an alreadycreped paper-strip, the crepingmay be performed by one or more of .the three sets of folding-rollersand the depths of the valleys and the heights of the intervening ribsmay be tapered or graduated so as to preliminarily curve the stripedgewise the desired amount to conform substantially to the curvature ofthe surface of the mandrel.

If preferred, to reduce the time taken for making a given length oftubular body of the ltype indicated, two or moreY of the duplex orfolded strips arranged in parallel may be Wound on the mandrelsimultaneously or substantially so.

Those acquainted with this art will readily understand that theinvention as presented in the appended claims is not necessarilyrestricted to the precise and exact details set forth and thatmodifications may be resorted to without departure from the heart andessence of the invention and without the loss or sacrifice of any of itssubstantial benefits and advantages.

I claim:

1. In a round hollow body composed of a helically-wound ribbon ofuneven-surface material folded over along a longitudinal line with itstwo lengthwise sections in face-to-face contact with one another, theouter surfaces of such wound duplex ribbon being in register with, andin contact with, one another, and means adhering such outer surfacestogether with passages between them, the convolutions of said foldedribbon being at an oblique angle to the axis of the body, the novelimprovement being that said ribbon has substantially-parallel surfacerugosities at an oblique angle to the lengthwise dimension of .theribbon, whereby the rugosities of said outer surfaces of the foldedribbon cross one another.

2. In a round hollow body composed of a helically-wound plurality ofindividual parallel registered uneven-surface ribbons adhered togetherin face-to-face contact with one another with passages between theribbons, the novel improvement being that said ribbons are crepepaperand that the rugosities of the contacting faces of the ribbons cross oneanother.

3. In a round hollow body composed of a helically-wound plurality ofindividual parallel registered uneven-surface ribbons adhered together,the novel improvement; being that cach said ribbon hassubstantially-parallel rugosities on both of its opposite surfaces andthat the rugosities of the contacting surfaces of the ribbons cross oneanother.

4. In a round hollow body composed of a helically-wound plurality ofindividual parallel registered uneven-surface ribbons adhered together,the novel improvements being that said ribbons are impregnated with anagent which precludes detrimental eiect on said ribbons of the medium ormedia with which the body is to come in contact in use, that said agentis said adhering means, that each said ribbon has substantially-parallelrugosities on both of its opposite surfaces, and that the rugosities oi'the contacting surfaces of the ribbons cross one another. i

WALTER KASTEN.

